## Investigation of Choice for Mitral Stenosis ### Clinical Presentation Analysis The patient presents with classic features of mitral stenosis: - Progressive dyspnea and orthopnea (pulmonary congestion) - Loud S2 (increased pulmonary artery pressure) - Opening snap (abrupt halt of mitral valve opening) - Low-pitched diastolic murmur at apex (turbulent flow across stenotic valve) ### Role of Transthoracic Echocardiography with Doppler **Key Point:** Transthoracic echocardiography (TTE) with Doppler is the gold standard, first-line investigation for diagnosis and assessment of mitral stenosis severity. **High-Yield:** TTE provides: - Direct visualization of mitral valve morphology (leaflet thickening, calcification, commissural fusion) - Measurement of mitral valve area (MVA) — normal >4 cm²; severe <1 cm² - Pressure half-time (PHT) calculation for MVA estimation - Mean transmitral gradient assessment - Left atrial size and left ventricular function - Associated lesions (aortic valve disease, tricuspid regurgitation) - Pulmonary artery pressure estimation ### Severity Classification by MVA | Severity | MVA (cm²) | Mean Gradient (mmHg) | Clinical Features | |----------|-----------|----------------------|-------------------| | Mild | 1.6–2.5 | <5 | Asymptomatic or minimal symptoms | | Moderate | 1.1–1.5 | 5–10 | Exertional dyspnea | | Severe | <1.0 | >10 | Dyspnea at rest, orthopnea | ### Why TTE is Superior - Non-invasive, reproducible, real-time assessment - No radiation exposure - Can be repeated for serial monitoring - Guides management decisions (medical vs. interventional) - Doppler quantifies hemodynamic severity objectively **Clinical Pearl:** The opening snap occurs earlier (shorter A2–OS interval) in severe stenosis because of elevated left atrial pressure, pushing the mitral leaflets open more abruptly.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.